How To Install Memcached On Centos
Memcached is an open-source distributed memory object caching program that allows the states to improve and speed up the performance of dynamic spider web applications by caching data and objects in Memory.
Memcached is also used to cache entire database tables and queries to amend the performance of the database. It is the simply caching system bachelor freely and used by many large sites like YouTube, Facebook, Twitter, Reddit, Drupal, Zynga, etc.
Read Also: How to Install and Configure Memcached on CentOS 8
Memcached can commit to deprival of service attacks if not correctly configured. In this article, nosotros will explain how to install and secure your Memcached server on CentOS seven Linux distribution. These given instructions also piece of work on RHEL and Fedora Linux.
Installing Memcached in CentOS 7
First, update your local software parcel index and and then install Memcached from the official CentOS repositories using post-obit yum commands.
# yum update # yum install memcached
Next, nosotros will install libmemcached – a customer library that offers a couple of tools to manage your Memcached server.
# yum install libmemcached
Memcached should now exist installed on your CentOS system as a service, along with the tools that required y'all to test its connectivity. Now we can proceed further to secure its configuration settings.
Securing Memcached Configuration Settings
To make clinch that installed Memcached service is listening on the 127.0.0.1 local interface, we will alter the OPTIONS variable in the /etc/sysconfig/memcached configuration file.
# vi /etc/sysconfig/memcached
Search for the OPTIONS variable, and add the -50 127.0.0.one -U 0 to OPTIONS variable. These configuration settings will protect our server from denial of service attacks.
/etc/sysconfig/memcached
PORT="11211" USER="memcached" MAXCONN="1024" CACHESIZE="64" OPTIONS="-fifty 127.0.0.1 -U 0"
Permit'south discuss each of the above parameters in item.
- PORT : The port used by Memcached to run.
- USER : The offset-up daemon for Memcached service.
- MAXCONN : The value used to gear up max simultaneous connections to 1024. For decorated web servers, you tin can increase to whatsoever number based on your requirements.
- CACHESIZE : Set cache size memory to 2048. For decorated servers, you tin increase upwards to 4GB.
- OPTIONS : Set the IP address of the server, and so that Apache or Nginx web servers can connect to information technology.
Restart and enable your Memcached service to apply your configuration changes.
# systemctl restart memcached # systemctl enable memcached
Once started, you lot can confirm that your Memcached service is bound to the local interface and listening only on TCP connections using following netstat command.
# netstat -plunt
Y'all can also check the stats of the server using memcached-tool as shown.
# memcached-tool 127.0.0.1 stats
Now brand sure to allow admission to the Memcached server by opening a port 11211 on your firewall as shown.
# firewall-cmd --permanent --zone=public --add-port=11211/tcp
Install Memcached PHP extension
Now, install a PHP extension to work with the Memcached daemon.
# yum install php-pecl-memcache
Install Memcached Perl Library
Install Perl library for Memcached.
# yum install perl-Enshroud-Memcached
Install Memcached Python Library
Install python library for Memcached.
# yum install python-memcached
Restart Web Server
Restart the Apache or Nginx service to reflect changes.
# systemctl restart httpd # systemctl restart nginx
Cache MySQL Queries with Memcached
It isn't an easy task for all, you need to use API'southward to modify your PHP codes to enable MySQL caching. Yous tin can find the examples codes at Memcache with MySQL and PHP.
That's Information technology! In this article, we take expanded how to install and secure your Memcached server to the local network interface. If you have faced any issues during installation, do inquire for assist in our comment section beneath.
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